Click on arcs to cycle their color. A valid coloring requires: at each crossing, all three arcs are either the SAME color or ALL DIFFERENT.
RedBlueGreen
Click arcs to color them
Coloring Rule: At each crossing where arcs a, b, c meet: either a = b = c (all same) or a, b, c all different. A "trivial" coloring uses only one color.
3-colorability is a knot INVARIANT: it does not change under Reidemeister moves. If a knot is 3-colorable, it is NOT the unknot!